Pressure valve



Nov. 8, 192 7.

P. A. MYERS PRESSURE VALVE 2 Sheets-Sheet l Filed June 21, 1926 www -INVENTOR. PHIL/P 1'4. MYERS, BY

A TTORNEYS.

Nov. 8, 1927.

P. A. MYERS PRESSURE VALVE 2 Sheets-Sheet 2 if M Filed June 21, 1926INVENTOR. PHIL/P A. MYERS, BY

ATTORNEYS.

Patented Nov. 8, 1927.

UNITED STATES 1,648,499 PATENT OFFICE.

PHILIP A. MYERS, 0F ASHLAND, OHIO, ASSIGNOR TO THE F. E. MYERS 8t BRO.COM- .PANY, 0F ASHLAND, OHIO, A CORPORATION OF OHIO.

PRESSURE VALVE.

Application filed June 21, 1926. Serial No. 117,801.

This invention relates to pressure valves for use with power spray pumpsand spray tanks.

The general object of the invention is to provide an eflicient andhighly practical pressure or relief valve which Wlll automatically openwhen the desired maximum pressure of the spray liquid dellvered lnto thevalve by a power pump fed 0r supplied by the spray-mixture tank, usuallymounted on a chassis to make it portable, to permit the excess of liquidto pass out of the valve and return to the tank.

To this end my improved pressure valve consists, essentially, of acasing divided into a receiving chamber and a pressure chamber, with avalve between them which will seat when the pressure becomes excessivein the pressure chamber, or a diaphragm operated by this excess ofpressure to actuate a yoke, and of a relief valve in the receivlngchamber actuated by such yoke to allow the excess of fluid which iscreating the excess of pressure to escape from the valve casing andreturn to the fluid tank from which it came on entering the pump.

Such is the general organization of my improved relief valve, theparticularities of which will appear hereinafter.

In the accompanying drawings,

Figure 1 is a vertical sectional View taken through the valve in itsentirety.

Figure 2 is a transverse vertical sectional view taken on the line 2 2of Figure 1.

Letit be supposed that a tank or vessel containing the spray liquid isassociated with this valve, and that a power pump intervenes between thetank and this valve and is connected with the valve through a pipeindicated at 1.

When the pump is operated as by an associated gasoline engine, it willpump the spray liquid from the tank through the pipe 1 into the valvecasing indicated generally at 2. This casing, usually made of castbrass, comprises an interior receiving chamber 3 and a pressure chamber4; separated by an integral partition 5 and a pressure-retaining valve6. This valve is seated in a cage 7 mounted on the partition 5. When theliquid fills the chamber 3, it then lifts the valve 6 and fills thechamber 4 which normally remains filled as the excess of the liquid orthe oncoming supply discharges through theport 8 and goes thence into ahose by which it is directed upon the trees or other plants which are tobe sprayed.

But there are times when the user desires to close his nozzle and cutoffthe supply of the spray fluid. With this pressure valve he may do sowith freedom. l/Vhen he closes his nozzle, the pressure instantly risesin the pressure chamber. and actuates the diaphragm and piston plungerwhich through the yoke will unseat the discharge valve and allow theliquid to flow to the by-pass and thence back into the tank. Thus theliquid will flow from the tank to .the pump, from the pump to the valve,and from the valve into the tank at times when the nozzle is closed, andthere being no resistance at that time the engine may be throttled downto run slowly if that be desired, the engine being relieved of the load.Usually the valve will be set for normal pressure at, say 300 to 400pounds to the square inch in the pressure chamber 4. Any excess ofpressure will operate in the manner now to be described. a.

The relief mechanism consists of a pressure diaphragm indicated at 9 andextending across the upper part of the pressure chamber 4. Thisdiaphragm is secured in place by the extension of the casing indicatedat 10 in the nature of a cylindrical cap. Then in the bore 11 of thiscylindrical cap is slidingly mounted a plunger designated 12. Thisplunger rests upon and reenforces the diaphragm, the diaphragm acting toprevent any leakage of the liquid from the chamber 4 into the bore 11,but yielding to the pressure and thereby actuating the plunger 12,

that is to say, yielding when the pressure is in excess of that forwhich the valve is set, say 300 or 400 pounds.

The upper portion of the plunger 12 travels in the adjoining part of theextension 10 and carries a spring 13 positioned around the stem 14 ofthe plunger, which stem is guided in a part of the tension nut 15screwed upon the extension 10. The up- .per end of the spring 13 bearsagainst the tension nut and the tension of the spring is regulated byadjusting this nut up or down in its threaded connection with theextension 10.

Thus itwill be understood that any pressure in excess of that for whichthe plunger with its diaphragm has been set will act to liftthediaphragm and plunger against the liquids.

pressure" of the spring. The plunger is equipped with a cross pin 16 asmore clear- 1y shown in Figure 2, and the extension 10 is slotted asseen at 17 to permit the cross pin to travel up and down with themovements of the plunger 12-upward when Vielding to excessive pressureand downward y the action of the spring 13 when the excess of pressurehas been lifted.

The cross pin 16 carries a yoke 18 which extends down and carries at itslower end an adjustable valve lifter 19 in the nature of a rod screwedthrough the yoke and having a head 20 to receive a wrench so that thelifter may be positioned as required in the proper assembling of theparts. A look nut 21 insures holding the lifter 19 in any adjust dposition. This lifter passes through a stu ing box generally indicatedat 22, consisting of a gland and suitable packing carried by the lowerportion 23 of the general valve casing. This part of the casing isformed of a separate shell suitably connected with the general valveshell and carrying a valve cage 24 affording a seat and guide for anunloading valve 25 preferably of spherical form.

It will now be seen that when the excess of pressure lifts the diaphragmand plunger 12, which in turn lifts the yoke 18 of the valve lifter 19,the valve 25 will be elevated from its seat by the lifter, and that,therefore, a part of the incoming spraying liquid entering through thepipe 1 into the receiving chamber 3 will be allowed to escape throughthe passage 26 in the cage 24: and thence through the chamber 27 in theshell 23 and to the by-pass pipe 28 which leads back to the tankcontaining the supply of This escape of liquid from the chamber 3relieves the excess pressure in the chamber 4 because the quantity ofliquid that created the excess of pressure in the chamber 4 is therebyreduced, 'so that substantially as much liquid will flow out of thedisfiharge port 8 as currently enters the cham- To form a stop to limitthe movement of the unloading valve 25 .a projection 29 is formed on thecap 30. This cap is made removable in order to give access to theinterior of the receiving chamber 3 for occasionally cleansing theunloading valve 25 and its seat in the cage 24:. The cap 30 is held inplace by a clamp consisting of a bar 31 suit-' ably connected at itsends 32 with the valve casing and carrying a binding screw 33.

To supply lubricant to the lifter 19 a grease cup '34 is mounted on theshell 23 as seen in Figure 1.

While I have referred to the use of this pressure valve with power spraypumps and spraytanks, it is to be understood that it is applicable tomany other uses and that other uses are contemplated by me.

It will be understood that I desire to'comprehend within my inventionsuch modifications as may be necessary to adapt it to varying conditionsand uses.

Having thus fully described my invention, what I claim as new. anddesire to sesure by Letters Patent, is:

1. In a pressure valve, the combination with a casing divided into areceiving chamber and a pressure chamber, a port in the partitionbetween the chambers, a downward seating valve in said port, an outletport for the pressure chamber, an outlet port for the receiving chamber,a valve for the latter and an inlet for the receiving chamber, of 8..diaphragm .and plunger extending across one end of the pressure chamber,an extension on the casing forming an enclosure and guide for theplunger, a spring acting on the plunger and a tension nut screwed on theextension and contacting with the spring, a transverse pin carried bythe plunger, a yoke connected to said pin and extending thence down thesides of the casing, a lifter connected to the lower end of the casingand adapted to unseat the outlet valve of the receiving chamber when thediaphragm and plunger are actuated by excess pressure, and a means forlimiting the movement of the outlet valve.

2. In a pressure valve, the combination with a casing, a receivingchamber therein, an inlet pipe therefor adapted to extend to a pump, andan outlet by-pass pipe adapted to extend to a spray liquid tank, apressure chamber within the casing, a port in the partition between saidchamber, a valve for said port and an outlet for each chamber, of adiaphragm and plunger extending across the end of' the pressure chamber,a spring acting-on the piston to resist normal pressures in the pressurechamber and to permit the diaphragm and plunger to yield to excesspressures therein, a valve for the outlet port of the receiving chamber,a yoke connected to the plunger and a lifter actuated by the yoke tounseat said outlet valve, whereby an excess of pressure in thepressurechamber will .cause the outlet valve to be unseated and giv-erelief by the outflow of liquid from the receiving chamber, and aremovable cap fitting into the casing of the receiving chamber adjacentthe outlet valve, the cap being provided with a projection for limitingthe movement of the said outlet valve. I

In testimony whereof, I aflix my signature.

PHILIP A. MYERS.

